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Gamma Irradiation Quarantine Treatment Against Blueberry Maggot and Apple Maggot (Diptera: Tephritidae)

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Abstract:

The criterion for efficacy of irradiation disinfestation treatments against tephritid fruit flies has been prevention of adult emergence. Although this technique has worked well for tropical tephritids that do not diapause, it is difficult to apply to diapausing insects that must be brought out of diapause by lengthy and not entirely successful procedures. Therefore, a more reliable method of measuring efficacy of irradiation quarantine treatments against diapausing tephritids is needed. Some Tephritidae are known to diapause as phanerocephalic pupae. Accordingly, that would be the latest stage that could be used to determine efficacy without the complications posed by estimating diapause survival. Prevention of the phanerocephalic pupa at the 99% level was accomplished with an estimated 58 and 24 Gy for the apple maggot, Rhagoletis pomonella (Walsh), and the blueberry maggot, Rhagoletis mendax Curran, respectively, when irradiated as 3rd instars in fruits. Adult apple maggot emergence was prevented with an estimated 15 Gy, which was 26% of the dose required to prevent pupation to the complete phanerocephalic stage. Prevention of the phanerocephalic pupa can be determined ≈6 d after pupariation at ambient temperatures, making it possible to adjust research parameters during a limited season, such as when working with the blueberry maggot, which is available in the field in blueberries during late July through early September. Although basing efficacy of irradiation quarantine treatments against diapausing tephritids on prevention of pupation will result in substantially higher doses than basing efficacy on prevention of adult emergence, the research can be done more rapidly and with greater confidence, and many temperate fruits, including blueberries and apples, tolerate much higher radiation doses than those required to prevent pupation of tephritids.

Keywords: Rhagoletis mendax; Rhagoletis pomonella; disinfestation; ionizing radiation; irradiation; phanerocephalic pupa

Document Type: Research Article

Publication date: December 1, 1999

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  • Journal of Economic Entomology is published bimonthly in February, April, June, August, October, and December. The journal publishes articles on the economic significance of insects and is divided into the following sections: apiculture & social insects; arthropods in relation to plant disease; forum; insecticide resistance and resistance management; ecotoxicology; biological and microbial control; ecology and behavior; sampling and biostatistics; household and structural insects; medical entomology; molecular entomology; veterinary entomology; forest entomology; horticultural entomology; field and forage crops, and small grains; stored-product; commodity treatment and quarantine entomology; and plant resistance. In addition to research papers, Journal of Economic Entomology publishes Letters to the Editor, interpretive articles in a Forum section, Short Communications, Rapid Communications, and Book Reviews.
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